Speaker Circuit

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Speaker Circuit
- Speaker Circuit

DESCRIPTION

* If the vehicle has a built-in type amplifier, a sound signal is sent from the radio receiver to the speakers via the "Standard Models" circuit.

* If the vehicle has a separate type amplifier, a sound signal from the radio receiver is amplified by the stereo component amplifier and then transmitted to the speaker via the "Premium Models" circuit.

If there is a short in this circuit, the stereo component amplifier detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier or speakers.

WIRING DIAGRAM













INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connectors shown in the illustration from the stereo component amplifier or radio receiver and speakers.





(b) Premium models:

Measure the resistance between each of the front No. 2 speakers and the stereo component amplifier to check for an open circuit in the wire harness.





Standard resistance:





(c) Standard models:

Measure the resistance between each of the front No. 2 speakers and the radio receiver to check for an open circuit in the wire harness.

Standard resistance:





(d) Premium models:

Measure the resistance between each of the front No. 1 speakers and the stereo component amplifier to check for an open circuit in the wire harness.

Standard resistance:





(e) Standard models:

Measure the resistance between each of the front No. 1 speakers and the radio receiver to check for an open circuit in the wire harness.

Standard resistance:





(f) Premium models:

Measure the resistance between each of the rear speakers and the stereo component amplifier to check for an open circuit in the wire harness.

Standard resistance:





(g) Standard models:

Measure the resistance between each of the rear speakers and the radio receiver to check for an open circuit in the wire harness.

Standard resistance:





(h) Premium models:

Measure the resistance between each of the rear stereo component speaker and the stereo component amplifier to check for an open circuit in the wire harness.

Standard resistance:





(i) Premium models:

Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.

Standard resistance:





(j) Standard models:

Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT FRONT NO. 1 SPEAKER

(a) Resistance check

(1) Measure the resistance between the terminals of the speaker.

Standard resistance:

Premium models
Standard models










NG -- REPLACE FRONT NO. 1 SPEAKER
OK -- Continue to next step.

3. INSPECT FRONT NO. 2 SPEAKER

(a) Check that the malfunction disappears when another speaker in good condition is installed.

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the front No. 2 speaker.
* When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
* Perform the above inspection on both LH and RH sides.

NG -- CONFIRM MODEL

OK -- REPLACE FRONT NO. 2 SPEAKER

4. CONFIRM MODEL

Result:





B -- INSPECT REAR SPEAKER
A -- Continue to next step.

5. INSPECT REAR SPEAKER

(a) Resistance check

(1) Measure the resistance between the terminals of the speaker.

Standard resistance:





NG -- REPLACE REAR SPEAKER
OK -- Continue to next step.

6. INSPECT REAR STEREO COMPONENT SPEAKER

(a) Rear stereo component speaker:





(1) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NOTICE:
The speaker should not be removed when checking resistance.

NG -- REPLACE REAR STEREO COMPONENT SPEAKER

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

7. INSPECT REAR SPEAKER

(a) Resistance check

(1) Measure the resistance between the terminals of the speaker.

Standard resistance:





NG -- REPLACE REAR SPEAKER

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table